The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 1980
Filed:
Sep. 02, 1975
Ronald Golden, Mt. Prospect, IL (US);
Champion International Corporation, Stamford, CT (US);
Abstract
Hidden entries are provided on a receptor sheet by applying the desired intelligence to the sheet with a chemical densensitizing agent capable of preventing the formation of a visible image on the receptor sheet when the sheet is contacted with a mark-producing agent. The resulting visible image is provided in the form of a negative wherein the background of the visible image is provided by the mark-forming agent, while the foreground of the visible image is the densensitized portion of the sheet. The mark-forming system comprises a chromogenic composition which is applied to the surface of the receptor sheet adjacent the desensitized portion thereof. The coreactant for the chromogen may either be present on the receptor sheet prior to providing the hidden image thereon by means of a chemical desensitizer, or may be admixed with the chromogen prior to application thereof to the surface of the sheet.